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PDIU-DS Modem Pool Installation ––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
144
DKAdmin/DKBackup
PPCT (Modular to DB25) Adaptor, Modified Wiring for Connecting TTY Jack to
an External Modem (only if null-modem adaptor is not used with PPTC):
PIOU/PIOUS, TTY Jack
Modular Pin Number
1 to RD
2 to TD
3 to DSR
4 to DTR
5 to DCD
6 to SG
RD,
TD,
DSR,
DTR,
DCD,
SG,
6 to
5 to
4 to
3 to
2 to
1 to
2*
3*
6
8*
20*
7
4 Jumper to 5
TD
RD
DSR
DCD
DTR
SG
RTS to CTS
Modular Pin No.
PPTC1A-5M Adaptor
DB25 Pin No.
Modem
RS-232
Lead Name
0926
Important!
*
PPTC1A-5M, pins 2 & 3 and pins 8 & 20 must be reversed in the field, as
shown, for modem connection. Set Hayes modem to track status of carrier
detect signal (AT and C1) and to answer (ATS0 = 1).
Figure 24 External Modem to Strata DK TTY Port Connection